From 9d983ec77bd066dbdf00ec839833708deb566415 Mon Sep 17 00:00:00 2001
From: Jeroen Peeters <jeroen.peeters@evance.be>
Date: Mon, 20 Aug 2018 13:22:46 +0200
Subject: [PATCH] feat: add storage APi's and example

Imported from CityOfZion/neo-storm (86ac5c215a2c6ec710f2fd913e0ace63d6ea993e).
---
 examples/{ => check_witness}/check_witness.go |  0
 examples/storage/storage.go                   | 46 +++++++++++++++++++
 interop/storage/storage.go                    | 19 ++++++++
 3 files changed, 65 insertions(+)
 rename examples/{ => check_witness}/check_witness.go (100%)
 create mode 100644 examples/storage/storage.go
 create mode 100644 interop/storage/storage.go

diff --git a/examples/check_witness.go b/examples/check_witness/check_witness.go
similarity index 100%
rename from examples/check_witness.go
rename to examples/check_witness/check_witness.go
diff --git a/examples/storage/storage.go b/examples/storage/storage.go
new file mode 100644
index 000000000..26a7f5dc7
--- /dev/null
+++ b/examples/storage/storage.go
@@ -0,0 +1,46 @@
+package storage_contract
+
+import (
+	"github.com/CityOfZion/neo-go-sc/interop/storage"
+)
+
+func Main(operation string, args []interface{}) interface{} {
+	var ctx = storage.GetContext()
+
+	// Puts value at key
+	if operation == "put" {
+		if checkArgs(args, 2) {
+			key := args[0].([]byte)
+			value := args[1].([]byte)
+			storage.Put(ctx, key, value)
+			return key
+		}
+	}
+
+	// Returns the value at passed key
+	if operation == "get" {
+		if checkArgs(args, 1) {
+			key := args[0].([]byte)
+			return storage.Get(ctx, key)
+		}
+	}
+
+	// Deletes the value at passed key
+	if operation == "delete" {
+		key := args[0].([]byte)
+		storage.Delete(ctx, key)
+		return true
+	}
+
+	// TODO: storage.Find()
+
+	return false
+}
+
+func checkArgs(args []interface{}, length int) bool {
+	if len(args) == length {
+		return true
+	}
+
+	return false
+}
diff --git a/interop/storage/storage.go b/interop/storage/storage.go
new file mode 100644
index 000000000..de803e87c
--- /dev/null
+++ b/interop/storage/storage.go
@@ -0,0 +1,19 @@
+package storage
+
+// Context represents the storage context
+type Context interface{}
+
+// GetContext returns the storage context
+func GetContext() interface{} { return nil }
+
+// Put value at given key
+func Put(ctx interface{}, key interface{}, value interface{}) {}
+
+// Get value matching given key
+func Get(ctx interface{}, key interface{}) interface{} { return 0 }
+
+// Delete key value pair from storage
+func Delete(ctx interface{}, key interface{}) {}
+
+// Find values stored on keys partially matching given key
+func Find(ctx interface{}, key interface{}) interface{} { return 0 }